/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *    FileEditor.java
 *    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui;

import java.awt.Container;
import java.awt.Dialog;
import java.awt.FontMetrics;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorSupport;
import java.io.File;
import javax.swing.JFileChooser;

/**
 * A PropertyEditor for File objects that lets the user select a file.
 * 
 * @author Len Trigg (trigg@cs.waikato.ac.nz)
 * @version $Revision: 7059 $
 */
public class FileEditor extends PropertyEditorSupport {

	/** The file chooser used for selecting files */
	protected JFileChooser m_FileChooser;

	/**
	 * Returns a representation of the current property value as java source.
	 * 
	 * @return a value of type 'String'
	 */
	public String getJavaInitializationString() {

		File f = (File) getValue();
		if (f == null) {
			return "null";
		}
		return "new File(\"" + f.getName() + "\")";
	}

	/**
	 * Returns true because we do support a custom editor.
	 * 
	 * @return true
	 */
	public boolean supportsCustomEditor() {
		return true;
	}

	/**
	 * Gets the custom editor component.
	 * 
	 * @return a value of type 'java.awt.Component'
	 */
	public java.awt.Component getCustomEditor() {

		if (m_FileChooser == null) {
			File currentFile = (File) getValue();
			if (currentFile != null) {
				m_FileChooser = new JFileChooser();
				m_FileChooser.setSelectedFile(currentFile);
			} else {
				m_FileChooser = new JFileChooser(new File(
						System.getProperty("user.dir")));
			}
			m_FileChooser
					.setApproveButtonText(Messages
							.getInstance()
							.getString(
									"FileEditor_GetCustomEditor_FileChooser_SetApproveButtonText_Text"));
			m_FileChooser.setApproveButtonMnemonic('S');
			m_FileChooser
					.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
			m_FileChooser.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					String cmdString = e.getActionCommand();
					if (cmdString.equals(JFileChooser.APPROVE_SELECTION)) {
						File newVal = m_FileChooser.getSelectedFile();
						setValue(newVal);
					}
					closeDialog();
				}
			});
		}
		return m_FileChooser;
	}

	/**
	 * Returns true since this editor is paintable.
	 * 
	 * @return true.
	 */
	public boolean isPaintable() {
		return true;
	}

	/**
	 * Paints a representation of the current Object.
	 * 
	 * @param gfx
	 *            the graphics context to use
	 * @param box
	 *            the area we are allowed to paint into
	 */
	public void paintValue(java.awt.Graphics gfx, java.awt.Rectangle box) {

		FontMetrics fm = gfx.getFontMetrics();
		int vpad = (box.height - fm.getHeight()) / 2;
		File f = (File) getValue();
		String val = Messages.getInstance().getString(
				"FileEditor_PaintValue_Val_Text");
		if (f != null) {
			val = f.getName();
		}
		gfx.drawString(val, 2, fm.getHeight() + vpad);
	}

	/**
	 * Closes the dialog.
	 */
	protected void closeDialog() {
		if (m_FileChooser instanceof Container) {
			Dialog dlg = PropertyDialog
					.getParentDialog((Container) m_FileChooser);
			if (dlg != null)
				dlg.setVisible(false);
		}
	}
}
